Manchester United defender Nemanja Vidic has been ruled out for up to three weeks with the knee injury picked up against AS Roma.
The Serbia international limped out of Tuesday's 2-0 Champions League quarter-final first leg victory in Rome after landing awkwardly and was sent for an initial scan on Wednesday.
The initial result was inconclusive due to swelling around the knee but a second scan has revealed a minor problem.
"There is no major damage to left knee and he will be out for two to three weeks," a spokesman told the club's official website.
The 26-year-old centre-half will now miss Saturday's trip to Middlesbrough and further Premier League clashes with Arsenal and Blackburn Rovers, plus next week's Champions League quarter-final second leg tie with AS Roma.
However, the news comes as a boost for United who feared one of the cornerstones of their defence could miss the rest of the campaign.
Vidic has made 41 appearances this season at the heart of a defence which is on the verge of setting a new club record for fewest league goals conceded.
The Red Devils have conceded just 15 league goals this season and are on course to better their record of 25 let in during the 1997/98 campaign.
However, Chelsea hold the Premier League record, having conceded just 15 during their 2004/05 title-winning campaign.